Luxury Auto Maker on Mission to Widen Brand Appeal

GENEVA—Bentley Motors took the wraps of its fastest-ever model, a new version of its Continental Grant Tourer coupe, at the Geneva Motor Show on Tuesday amid stiffening competition at the high end of the luxury segment of the car industry.

The fabled British car maker, part of Germany's Volkswagen AG, expects the new Speed version of its flagship GT car will attract existing customers looking for that extra kick. The coupe has a top...